(Petrolacosaurus,(Hovasaurus,((Thadeosaurus,Claudiosaurus),(Hupehsuchus,(Utatsusaurus,Parvinatator,((Grippia,Chaohusaurus),((Cymbospondylus_petrinus,Cymbospondylus_buchseri),((Mixosaurus_cornalianus,(Mixosaurus_atavus,Mixosaurus_nordenskioeldii)),((Besanosaurus,(Shastasaurus,Shonisaurus)),(Toretocnemus,(Californosaurus,(Macgowanania,(Hudsonelpidia,(Suevoleviathan,(Temnodontosaurus,((Stenopterygius,(Hauffiopteryx,(Leptonectes,Excalibosaurus,Eurhinosaurus))),(Ichthyosaurus,(Brachypterygius,(Opthalmosaurus,(Caypullisaurus,Platypterygius))))))))))))))))))));